Typewriting machine



Oct. 3, 1933. HART 1,929,064

TYPEWRITING MACHINE Filed Dec. 1. 1931. 4 Sheets-Sheet l r WITNESSES z?36 35 E408 INVENTOR h g 5 7 mil? //0 g ATTORNEY Oct. 3, 1933.

F. A. HART TYPEWRITING MACHINE Filed Dec. 1. 1931 4 Sheets-Sheet 2 VINVENTOR M @44 BYWJMM ATTORNEY WITNESSES 'Oct. 3, 1933. F. A. HARTTYPEWRITING MACHINE Filed Dec. 1. 1931 4 Sheets-Sheet 3 ATTORNEY Oct. 3,1933. F. A. HART TYPEWRITING MACHINE v 4 Shegt's-Sheet 4 Filed Dec. 1.1931 N3 3. HMS

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INVENTOR WITNESSES $4 ORM/m ATTORNEY Patented Oct. 3, 193-3 UNITEDSTATES PATENT OFFICE 1,929,064 v 'ITYPEWRITING MACHINE ApplicationDecember 1, 1931. Serial 578,284 25 Claims.- (01. 197-13) My inventionrelates to typewriting and like machines and more particularly to caseshift mechanism therefor.

One of the main objects of my invention, generally stated, is to provideimproved and highly efficient power actuated case shift mechanism.

A further object of my invention is to provide power driven case shiftmechanism which may be readily incorporated in existing machines withoutmodifying, or materially modifying, ex-

isting structural features thereof.

To the above and other ends which will hereinafter appear, my inventionconsists in the features of construction, arrangements of parts andcombinations of devices set forth in the following description andparticularly pointed out in the appended claims.

In the drawings, wherein like reference characters indicatecorresponding parts in the differcut views:-

Fig. 1 is a detail, fragmentary, side elevation, with parts in section,of as much of a typewriting machine as is necessary to illustrate myinvention in its embodiment therein, the parts being shown in the normalposition. a

Fig. 2 is an enlarged, detail, perspective view of some of the parts ofthe case shifting mechanism shown in Fig. 1.

Fig. 3 corresponds in part to Fig. 1 but shows the parts in the actuatedposition as they appear when the case shift keyis held depressed, butbefore the actuating cam has completed its cycle.

Fig. 4 is an enlarged, detail vertical sectional view taken on the. line4-4 of Fig. 1 and looking in the direction of the arrows at'said line.

Fig. 5 is a diagrammatic side view illustrating the driving connectionsfrom the motor to the case shift mechanism. v

Fig. 6 is a detail view of the actuating cam and associated parts asviewed from the lefthand side of the machine.

Fig. 7 is a detail, fragmentary rear elevation, with parts in section,of a modified form of means for mounting and transmitting movement tothe case shiftable part or shift rail.

Fig. 8 is a detail vertical sectional view of the same taken on the line8-8 of Fig. 7 and looking in the direction of the arrows at said line.

Fig. 9 is an enlarged, detail, transverse sectional view taken on theline 99 of Fig. 8 and looking in the direction of the arrows at saidline.

I have shown my. invention in the present instance embodied in 9.Remington electrified. bookkeeping machine" such as is disclosed in myapplication Serial No. 510,941, filed Jan. 24, 1931, and in which thepresent invention, or certain features thereof, may be readilyincorporated without modifying, ormaterially modifying, the existingstructural features of such machine.

In said machine the upper main frame section 10 of the combinedtypewriting and computing machine is hinged at 11 (Fig. 5) to the basesection 12 of the frame. In accordance with my present invention theparts of the power actuated case shift mechanism are so constructed andarranged as not to interfere with the swinging back of the section 10 onits base section 12, and coacting parts on the two sections will,nevertheless, be brought into cooperative relation when the upper framesection 10 is lowered to effective position on the base section 12, aswill hereinafter more clearly appear.

A driving shaft 13 is mounted in suitable bearings in the base section12 of the frame, and at the left-hand end thereof where it extendsbeyond the base section, said shaft is provided with a gear 14. The gear14 meshes with an idler 15 that in turn meshes with a gear 16. The gear16 is carried by a shaft 17 on which a snatch roll 18 is fixed, saidsnatch roll actuating the alphabet printing type bars, not shown. Therighthand end of the shaft 17 has a pulley 17* secured thereto. Anendless belt 19 coacts with the pulley 1'1 and with a smaller pulley 20on the right-hand end of a shaft 21 on which cams 22 for actuatingnumerai printing type bars (not shown) are mounted. A gear 23 on therighthand end of the shaft 21 meshes with a pinion 24 on a drivingpulley 25. An endless belt 26 coacts with the pulley 25 and is drivenfrom a pulley 27 on the shaft 28 of an electric motor 29 that runscontinuously, in the present instance, when the machine is in use.Motion is thus transmitted from the motor shaft 28 through the belt 26to the shaft 21 and from said shaft through the belt 19 to the snatchroll shaft 17 and from the latter to the shaft 13.

The shaft 13 is employed in the machine for other purposes than thoseabout 'to be described, as will be understood, for "example, from aconsideration of my application Serial No. 575,345, filed Nov..16th,1931. I avail myself of the use of this shaft in the present instance onwhich to loosely mount a cam 30 by which the case shift mechanism isactuated. As will be under-' stood from a consideration of Fig. 1 thecam 30 is preferably mounted through ball bearings 31 on the shaft 13.Arranged beside the cam 30 and fixed on the shaft 13 is a locking wheel32, as shown in Figs. 1 and 6. This locking wheel is notched at regularintervals, as indicated at 33, for the reception of the nose 34 of alocking pawl or latch 35. Said latch is pivoted at 36 on one side of thecam and a spring 37 coacts with the latch to force it into engagementwith the locking wheel 32 and cause the cam 30 to turn with the motordriven shaft 13 on which the cam is mounted. A trip 38 normally coactswith a projection 39 on the latch to hold the latter against the forceof its spring 37 disengaged from the locking wheel 32, and to hold thecam against movement while the continuously moving shaft 13 turnsindependently thereof. At this time the reactive force of the spring 37tends to turn the cam anti-clockwise as the parts are shown in Fig. 6.In order to overcome this difficulty I provide a high spot 30 on the camand provide a pivoted arm 40 that carries a roller 41 and is drawn by aspring 42 towards the cam 30. The roller 41 bears against the peripheryof the cam and when the parts are in the normal position, shown in Fig.6, the roller will bear against the cam above the high spot 30 thereonand resist the tendency of the cam to turn in an anti-clockwisedirection (as the parts are shown in this view) under the reactive forceof its latch spring 3'7. For this purpose it will be understood ofcourse, that the effective force of the spring 42 is such that it willovercome the effective force of the latch spring 37.

Motion is transmitted from the cam 30 to the part that receives a caseshifting movement, the platen 43 in the present instance, by thefollowing means:

An arm or member 44 is pivoted at 45 and carries an anti-friction roller46 that bears against the periphery of the cam 30 to effect an upwardmovement of the arm when the cam revolves through the first half of itsrevolution. The second half of the revolution of the cam 30 brings thelow portion thereof beneath the roller 46 and enables the arm 44 toreturn to its lowermost position when such arm is released fromrestraint of its latching means to be hereinafter described.

The arm 44 carries a laterally projecting pin 4'? that overlies anindependently movable shiftin arm or member 48 arranged parallel withthe; arm 44 and mounted to turn on the same pivotal center 45 as saidarm 44. A spring 49 is coiled about a spacing sleeve 50 supported on thepivot 45 and arranged between and separating the arms 44 and 48. One end51 of this spring bears down on the arm 44, whereas the other end 52 ofthe spring bears upward against the arm 48. The effective force of thespring is therefore exerted to normally hold the arms 44 and 48 togetherto move. as one part, and its force is sufficient to afford a lifting ofthe platen without flexing said spring or changing the relation of thearms until the shifting platen meets a positive resistance, or isarrested by the usual case shift stops, as will hereinafter more clearlyappear. When this does occur the arm 48 will be arrested, whereas thearm 44 will continue its motion under the action of the cam 30 and thestressed spring 49 will apply its force to hold the shifted platen inits shifted position and-against rebound, as will presently more clearlyappear.

The arm 48 carries a laterally projecting pin 53 at the free endthereof. The forwardly projecting end 54 of an upright link or shiftingmember '55 overlies the pin 53, so that the member 55 is raised by andwith the arm 48. In Fig. l I have shown the member 55 connected to theusual case shift rail 56, the member 55 being guided at its lower end ina slotted guide 57 on the frame section 10 and connected to the lowerend of a counter balance spring 58, the upper end of said spring beingadjustably connected to an adjusting screw 59 carried by the top plate60 of the machine. In this figure the usual Remington carriage structureis shown comprising a truck 61 mounted on crossed bearing rollers 62that coact with fixed front and rear guide rails 63 and 64 respectivelyto support the carriage in its movement over the top plate from side toside of the machine. A platen frame 65 supports the platen 43 and isconnected to the truck by parallel links 66 and 67 to afford caseshifting movements of the platen from and back to normal position, the

platen being arrested in such movements by the usual case shift stops 68and 69. A centrally disposed roller 70 on a cross bar of the platenframe bears on the shift rail 56, and as the latter is elevated to thedotted line position in Fig. 1 the platen will be elevated to the uppercase position.

From certain aspects of my invention the character and construction ofthe parts to be shifted by the arm 48 is immaterial, it being immaterialwhether the platen or type basket is shifted. However, I have devised aspecial form of construction shown in Figs. '7, 8 and 9 which I preferto employ in combination with the power actuated case shift devicesdisclosed herein, but which may be employed in other constructions withor without power actuated means. Such features disclosed in Figs. '7, 8and 9 are claimed herein and will be hereinafter described in detail.

It will be understood from what has been said that when the case shiftedpart, the platen 43 in the present instance, is arrested in its shiftedposition by the stops 68, a further elevation of the arm 44 by the cam30 will cause said arm to move independently of the arrested arm 48,thus further stressing the spring 49 and exerting its force to hold theshifted platen in its shifted position and to function properly whatevermay be the adjustment of the stops 68.

In order to lock the platen in its shifted position at each depressionof the case shift key and to hold the platen thus locked until the keyis released, even though the cam 30 has completed its cycle, I providethe following devices:

A latch, designated as a whole by the reference numeral 71, is pivotedat '72 to the base section 12 of the frame. This latch is provided witha cam edge 73 and a locking shoulder 74, and a finger or stop '75extends up in the rear of the shoulder. The arm 44 carries ananti-friction roller '76, preferably mounted on ball bearings, asindicated at '77 in Fig. 1. There is a spring '78 connected to the latch71 which tends to pull it forward and bring the shoulder '74 thereonbeneath the roller '76, as

key is held depressed, the spring 78 will be effective to pull the latch71 forward and bring the shoulder 74 beneath the roller 76 and lock theplaten in the upper case shifted position.

I will now explain how the latch 71 is controlled by the case shift key.

As shown in Fig. 3 a case shift key lever 79 is pivoted at 80 to theupper frame section 10. This lever carries a case shift key 81 and acase shift lock key 82. The latter key is carried by a looking lever 83pivoted at 84 of the lever 79 and provided with a depending engaging arm85 adapted, when the'key 82 is depressed, to engage a fixed abutment 86and lock the lever 79 in its actuated position, as shown in Fig. 3. Aspring 87 coacts with the lever 83 to free it from the abutment 86 whenthe key 81 is depressed, thus releasing the lever 79 and enabling it toreturn to normal position when the operator releases the key. A spring88 coacts with lever 79 to return it to normal position and theeffective force of this spring is greater than that of the spring 78 forreasons which will presently appear. The rear end of the lever 79 isprovided with a laterally projecting contact on pin 89 preferablyadjustably mounted on the lever as by an eccentric 90. This contactcoacts with the upper end of a slide 91, slotted at 92 intermediate itsends to receive the stem of a headed supporting screw 93 that isthreaded into the base section 12 of the frame. The lower end of theslide 91 is forked at 94 to straddle a pin 95 that projects laterallyfrom the latch 71.

When the parts are in the normal position shown in Fig. 1, the excessiveforce of the spring 88 acting through the lever 79 and slide 91 willovercome the force of the spring 78 and hold the latch 71 in theineffective position shown in said figure. When, however, either of thekeys 81, 82 is depressed the force of the spring 78 is effective to movethe latch 71 forward and when the roller 76 is elevated the shoulder 74on the latch will be brought beneath said roller and lock the parts inshifted position. This condition will maintain as long as either of thekeys 81, 82 is held depressed even though the foam 30 has no control ofthe arm 44, as indicated in Fig. 3. When the depressed key 81 or 82 isreleased, the return of the lever 79 to normal position will release thelatch 71 and enable the case shifted parts toreturn to normal position,

the roller 46 dropping down on the cam 30 which has completed its cycle.

The provision of ballbearings on which to mount the roller 76 enablesthe latch 71 to be easily moved to ineffectiveposition'by the action ofthe spring 88 notwithstanding the weight of the shiftable platen etc.exertedon the roller 76 and against the shoulder 74 of the latch.

I will now describe the means for controlling the trip 38 to enable thecam 30 to make one revolution, and only one revolution, at eachdepression of a case shift key.

A sub-lever 96 is pivoted intermediate its ends at 97 to the upper framesection 10. The forward end of this sub-lever is forked at 98 tostraddle a head pin 99 that extends laterally from the rear end of thecase shift key lever 79. The rear end of the sub-lever 96 carries alaterally projecting pin for contact 100 thereon. Said contact ispreferably adjustable on the sub-lever, as for example by an eccentric101 thereon received in an opening in the sub-lever. This contact 100coacts with the upper end of a sliding and swinging releasing device 102slotted at 103 to receive the stem of a headed screw 104 threaded intothe base section 12. A contractile returning spring 105 is connected atone end to a pin 106 on the device 102 and at the other end to a pin 107on the base section 12. The force of this spring is effective not onlyto move the device 102 upward but also to pull the lower end thereofforward. From an inspection of Fig. 2 it will be seen that the lower endof the device 102 extends through and is guided in a space between thetrip 38 and a guide bar 108 spaced apart from but secured at its ends tothe trip by shouldered rivets 109 and 110. The lower end of thereleasing device 102 is notched to provide an engaging shoulder 111 anda depending finger 112 adjacent thereto.

In the normal disposition of the parts shown inFig. 1 the trip 38 isheld in its effective position by a returning spring 113, the tripitself being pivoted at 38 to the base section 12. A stop 114 mounted onan eccentric 115 extends into the path of the trip 38 and limits itsreturn movement. In the normal position of the parts the finger 112 onthe releasing device 102 bears against the rivet 109 and limits afurther forward swinging movement of the releasing device, the shoulder111 on said device at the same time engaging the rivet 109. Thereleasing device also has a contact or pin 116 extending laterallytherefrom in the path of the high portion of the cam 30.

From the foregoing description it will be understood that a depressionof a case shift key 81 or 82 not only results in releasing the latch 71to enable it to function, but through the sub-lever 96 depresses thereleasing device 102 against the force of its spring 105. This resultsin moving the trip 38 down to disengageit from the latch 35. The latchspring 37 then becomes effective to bring about an engagement of thelatch 35 with the locking wheel 32 and to cause the cam 30 to revolvewith the shaft 13. In the first portion of the revolution of the cam thehigh portion thereof will be brought into engagement with the pin orcontact 116 and swing it to the position shown in Fig. 3. This resultsin disengaging the releasing device 102 from the trip 38 to enable thelatter to be immediatelyrestored to normal position where it extendsinto the path of the projection 39 on the latch 35 even though the caseshift key 81 or 82 be held depressed.

s As the cam 30 continues to revolve in an anticlockwise direction (asthe parts are shown in Fig. 3) the roller 46 will be elevated causing acase shifting of the platen, and the latch 71 will engage beneath theroller 76. Fig. 3 shows the .parts as they appear after the operationsabove described have taken place and before the cam 30 has completed itsrevolution.. In the continued movement of the cam from the Fig. 3position the projection 39 will coact with the trip 38 thus shifting thelatch 35 to releasing position and holding the cam against furthermovement while the shaft 13 continues its movement independentlythereof. The parts will remain in the position indicated as long as theoperator maintains pressure on the depressed key 81 or 82. "When,however, the operator releases the depressed key the lever 79 willreturn to normal position causing the latch 71 to be shifted rearward toreleasing position, thereby enabling the platen to return to lower caseposition; the roller 46 at this time dropping down and being arrested bythe cam 30.

The same return movement of the key lever 79 elevates the contact andenables the spring to return the releasing device 102 to normal positionready to function as before on .the next depression of a case shift key.

From what has been pointed out it will be understood that when the upperframe section 10 is turned back on its hinge 11 it carries with it notonly the carriage, the shift rail 56 and link 55, but also the shiftlever '19 and sub-lever 96 without any interference from the coactingparts. When the upper frame section 12 is swung down to operativeposition, said shift lever and sub-lever and parts 89 and 100respectively carried thereby will be brought into cooperative relationwith the parts with which they coact and the machine is in condition foroperation.

Referring now more particularly to Figs. '7, 8 and 9 which illustrate amodified form of case shifting features that I prefer to employ in connection with the power actuated features hereinbefore described, it willbe seen that the top plate 60' is provided with depending lugs 117; inthe present instance four in number. To each of these lugs is pivoted at118 an angular lever. The horizontally disposed arm 119 of each of theselevers is bifurcated at its end, each arm of the bifurcation having anupward extension 120. Received in each bifurcation and embracedby theextensions 120 is an arm 121 that extends through an opening 122 in thetop plate and has its broadened upper end 123 received in a slot 124 ina case shift rail 125. Each arm 121 is riveted to the shift rail at 126and may be regarded as a part of it. The lower end of each arm 121 ispivoted at 127 to the arm 119 of the associated angular lever. Thedepending arm 128 of each angular lever is pivoted at 129 to a link orbar 130 that extends transversely of the machine and connects all of theangular levers to move in unison. One end of the link 130 is bent atright angles to provide a laterally projecting lug 131. This lug ispierced to receive the stem of a headed screw 132 threaded into a nut133, exteriorly threaded to receive one end of a coiled counter-balancespring 134. The other end of this spring is anchored to a fixed bracketarm 135. I am enabled by this arrangement to provide a longcounter-balance spring 134 that extends transversely of the machine andeffectively coacts with the shift rail and the parts supported therebyto partly counter-balance the weight thereof; an adjustment of theeffective force of such spring being readily attained by the screw 132.

From an inspection of Fig. 8 it will be seen that a roller '70,corresponding to the roller '70 in the previously describedconstruction, is carried by the platen .frame 65 and bears on the shiftrail 125, which in this instance is rectangular in cross section to giveadded rigidity thereto. It also will be seen that the angular levers119, 128, all move in a vertical plane that extends transversely of themachine and is coincident, or substantially coincident, with the planeof movement of the shift rail 125. While the shift rail is located abovethe top plate 60, the angular levers are arranged below but in close'proximity to the top plate, and are. connected directly to the shiftrail or the depending arms 121 thereon. It will be observed, moreover,that in the present instance I have provided four angular levers 119,128 one located near each end of the shift rail and two locatedintermediate the ends of the rail.

In this manner-the shift rail is firmly supported and guided and ishighly efiicient in all cases but is of particular value in longcarriage machines where long case shift rails are employed and where itis difficult to effectively actuate 8 the shift rail and prevent it frombending.

Any suitable means may be employed for transmitting movement to theshift rail. In the present instance I pivot to one of the inner angularlevers 119, 128 an upright link or actuating 8 member 136 comprising tworelatively longitudinally adjustable members 137 and 138 united by anintermediate adjustable connecting member 139 having a right andleft-hand threaded connection therewith to draw the members 137, i 138together or move them away from each other to lengthen or shorten thelink. Lock nuts 140 secure the parts in the positions to which they arerelatively adjusted. In the present instance the upper end of the link136 is pivoted i on one of the pivots 127 which connects the associatedangular lever to the companion arm 121. Upward movement of the member136 will turn the angular lever to which it is attached, and through thelink 130 will impart a correll sponding movement to all of the otherangular levers. The lower end portion 138 of the link 136 extendsthrough a guide opening provided between two members 141, 142 of atwo-part bracket. The member 142 is secured by screws 1! 143 to theframe section 10, whereas the member 141 is detachably secured by screws144 to the bracket member 142. The lower end of the member 138 isprovided with a forwardly projecting contact 145 that bears on the pin53 1 carried by the arm 48.

It will be seen, therefore, that when the frame section 10 is swung backon the frame section 12 the link 136 will be lifted off the pin 53 andswing with the frame section 10. When the 1 frame section 10 is againswung down to eifective position on, the base section 12 the link 136will be brought into cooperative relation with the pin 53 to be actuatedthereby.

It also will be seen that the link 136 moves in 1 the same plane, orsubstantially the same plane, as the shift rail 125' and theintermediate connectdons by which it is shifted, thus providing a highlyeffective compact construction and one which overcomes manydisadvantages present in 1 prior constructions, especially where longcarriages are employed.

Various changes may be made in the construction, and parts thereof maybe employed without others, without departing from my invention 1 as itis defined in the accompanying claims.

What I claim as new and desire to secure by Letters Patent is:

1. The combination of a case shiftable part, and power actuated meansfor effecting a case 1 shifting movement of said part comprising a powerdriven shaft, a cam loosely mounted thereon, a case shift key, meanscontrolled thereby for fixedly connecting said cam and shaft to turntogether, and automatically operating means other than the cam forholding said case shiftable part in its shifted position as long as saidcase shift key is held depressed.

2. The combination of a case shiftable part, and power actuated meansfor effecting a case 1 shifting movement of said part comprising a powerdriven shaft, a cam, a spring returned case shift key, means controlledthereby for effecting a coupling of said cam to turn with said shaft,and automatically operating means other 1 than the cam for holding saidcase shiftable part in its shifted position as long as said case shiftkey is held depressed, said automatically operating means comprising alatch for holding the case shiftable part in its' shifted position, aspring which tends to move said latch to effective position, and meanscontrolled by the force of the spring of the case shift key forovercoming the force of the latch spring and for moving said latch toreleasing position when the case shift key returns to normal position.

though the case shift key be held depressed.

4. .The combination of a case shiftable part, and power actuated meansfor effecting a case shifting movement of said part comprising a powerdriven shaft, a cam, a spring returned case shift key, means controlledthereby for effecting a coupling of said cam to turn with said shaftincluding a pawl carried by said cam for coupling it to the shaft toturn therewith, means controlled by'said case shift key for releasingsaid pawl, said last mentioned means including means actuated by saidcam for affording an independ- 'ent return of the pawl releasing meansto effective position even though the case shift key be held depressed,a holding latch for holding the case shiftable part in its shiftedposition, a spring which tends to move said holding latch to effectiveposition, and means controlled by the force of the spring of the caseshift key for overcoming the force of the holding latch spring and formoving said holding latch to releasing position when the case shift keyreturns to normal position.

5. The combination of a caseshiftable part, and power actuated means forshifting said part comprising a-power actuated cam, an arm that isactuated thereby, a second arm'that shifts said case shiftable part,both of said arms being independently mounted to turnon the same fixedpivotal center, and a spring intermediate said arms and through whichmotion is transmitted from the first to the second arm under the actionof the cam, the construction and arrangement of shiftable part isarrested in its shifted position and a relative movement of the arms isthen afforded to hold the shifted part under pressure of said spring inshifted position.

6. The combination of a case shiftable part, and power actuated meansfor shifting said part comprising a motor driven shaft, a cam looselymounted on said'shaft, key controlled means for coupling said cam toturn with said shaft, an arm that is actuated by said cam, a second armthat shifts said case shiftable part, and a spring intermediate saidarms and through which motion is transmitted from the first to thesecond arm under the action of the cam. whereby the arms'shift togetheruntil the shiftable part is arrested in its shifted position and arelative movement of the arms is then afforded to hold the shifted partunder pressure of said spring in shifted position.

7. The combination of a case shiftable part, and power actuated meansfor shifting said part comprising a power actuated cam, an arm that isactuated thereby, a second arm that shifts said case shiftable part, aspring intermediate said arms and through which motion is transmittedfrom the first to the second arm under the action of the cam, wherebythe arms shift together until the shiftable part is arrested in itsshifted position and a relative movement of the arms is then afforded tohold the shifted part under pressure of said spring in shifted position,a spring returned case shift key, a latch for holding the case shiftablepart in its shifted, position, a spring which tends to move said latchto effective position, and meanscontrolled by the force of the spring o1the case shift key for overcoming the force of the latch spring and formoving said latch to releasing position when the case shift key returnsto normal position.

8. The combination of a case shiftable part, and power actuated meansfor effecting a case shifting movement of said part, comprising a powerdriven shaft, a cam, a pawl carried by said cam for coupling it to theshaft to turn therewith, a spring returned case shift key, meanscontrolled thereby for releasing said pawl and including means actuatedby said cam for affording an independent return of the pawl releasingmeans to effective position even though the case shift key be helddepressed, a latch for holding the case shiftable part in its shiftedposition, a spring which tends to move said latch to effective position,and means controlled by the force of the spring of the case shift keyfor overcoming the force of said latch spring and for moving saidlatchto releasing position when the case shift key returns to normalposition.

9. The combination of a case shiftable part, and power actuated meansfor effecting a case shifting movement of said part, comprising a powerdriven shaft, a cam, a pawl carried by said cam for coupling it to theshaft to turn therewith, a spring returned case shift key meanscontrolled thereby for releasing said pawl and including means actuatedby said cam for affording an independent return of the pawl releasingmeans to effective position even though the case shift key be helddepressed, a latch for holding the case shiftable part in its shiftedposition, a spring which tends to move said latch to effective position,means controlled by the force of the spring of the case shift key forovercoming the force of said latch spring and for moving said latch toreleasing position when the case shift key returns to normal position,two members through which movement is transmitted from said cam to saidcase shiftable part, anda spring which connectssaid members to movetogether andafford a relative movement between them when the shiftablepart is arrested in its shifted position and exert its force against theshiftable part this time.

10. The combination of a case shiftable part, and power actuated meansfor shifting it comprising a motor driven shaft, a cam loosely mountedon said shaft and having a high spot thereon, a spring engaged pawlcarried by said cam for coupling it to turn. with the shaft, keycontrolled means for releasing said pawl, and a spring pressed memberengaging said cam near the high spot thereon to prevent the reaction ofthe pawl spring from turning the cam when the pawl is released.

' 11. The combination of a case shiftable part, and power actuated meansfor shifting it comprising a motor driven shaft, a cam loosely mountedon said shaft and having a high spot thereon, a spring engaged pawlcarried by said cam for coupling it to turn with the shaft, keycontrolled -means for releasing said pawl, a spring pressed arm, aroller carried'by said arm and bearing against said cam and cooperativewith the 'high spot thereon to prevent the reaction of the pawl springfrom turning the cam when the pawl is released.

12. The combination of a case shiftable part, and power actuatedmeansfor shifting it comprising a motor driven shaft, a cam looselymounted on said shaft, a spring engaged pawl carried by said cam forcoupling it to turn with the shaft, a trip that is movable into and outof the path of said pawl to release it when the trip engages the pawl, acase shift key, a member actuated thereby to disengage the trip from thepawl, and means controlled by said cam for disengaging said member fromsaid trip to enable the latter to return into the path of the pawl eventhough said key be held depressed.

13. The combination of a case shiftable part, and power actuated meansfor shifting it comprising a motor driven shaft, a cam loosely mountedon said shaft, an arm actuated by said cam, a second arm operating toshift said shiftable part, a spring intermediate said arms and throughwhich motionis transmitted from the first mentioned arm to the secondarm, a latch engaging said second arm and holding it in shiftedposition, a spring which tends to move said latch to engaging position,a spring-returned case shift key lever, and a controlling elementintermediate said key lever and latch and by which the latch is moved toreleasing position by said key lever when released and by the force ofits returning spring which is sufficient to overcome the force of thelatch spring.

14. The combination of a case shiftable part, and power actuated meansfor shifting it comprising a motor driven shaft, a cam loosely mountedon said shaft, an arm actuated by said cam, a second arm operating toshift said shiftable part, a spring intermediate said arms and throughwhich motion is transmitted from the first mentioned arm to the secondarm, a latch engaging said second arm and holding it in shiftedposition, a spring which tends to. move said latch to engaging position.a spring returned case shift key lever, a controlling elementintermediate said key lever and latch and by which the latch is moved toreleasing position by said key lever when released and by the force ofits re-' turning spring which is sufficient to overcome the force of thelatch spring, a locking pawl carried by said cam, means coactingtherewith to lock the cam to revolve with said shaft. a trip coactingwith said locking pawl to release it, and means controlled by said caseshift key for con trolling said trip.

15. The combination of a top plate, a case shift rail, a plurality ofangular levers supported by the top plate and connected to said shiftrail, the plane of movement of said levers extending transversely of themachine, a connecting link between said levers for causing them to movein unison, and an actuating element connected to one of said angularlevers.

16. The combination of a top plate, a case shift rail arranged above thetop plate, a plurality of angular levers connected to and arrangeddirectly beneath said shift rail and arranged below and supported. bythe top plate, a longitudinally movable connecting bar or link betweensaid levers for causing them to move in unison, and an upright actuatingelement connected to one of said angular levers.

17.,The combination of a case shift rail, a plurality of leverspositively connected to said shift rail and movable substantially in theplane of movement thereof, and means for connecting said levers to shifttogether and thereby shift said shift rail. 7 H

18. The combination of a case shift rail, a plurality of leversconnected to said shift rail and having their planes of movementsubstantially in the plane of movement of the shift rail, a

counter balance spring extending in the general direction of the lengthof said shift rail and 0peratively connected to said levers, and meansfor simultaneously shifting said levers to thereby shift said shiftrail.

19. The combination of a case shift rail, levers connected to said shiftrail intermediate the ends thereof as well as near its ends, said leversbeing movable substantially in the plane of movement of the shift rail,means for connecting said levers to move in unison, and means foractuating said links to shift said shift rail.

20. The combination of a top plate, a shift rail arranged above the topplate, angular levers connected directly to said shift rail and arrangedbelow and fulcrumed on the top plate to move substantially in the planeof movement of the shift rail, means for connecting said levers to movein unison, a counter balance spring that is operatively connected tosaid levers and extends longitudinally in the direction of the length ofthe shift rail, and means for actuating said angular levers to effect acase shifting movement of the shift rail.

21. The combination of a top plate, a shift rail,

arranged above the top plate, angular levers connected directly to saidshift rail and arranged below and close to the top plate and fulcrumedthereon to move substantially in the plane of movement of the shiftrail, a link that extends longitudinally in the same general directionas the shift rail and is connected to all of said angular levers tocause them to move in unison, a counter balance spring connected to saidlink, and means for actuating said levers to effect a case shiftmovement of said shift rail.

22. The combination of a top plate, a shift rail arranged above the topplate, angular levers connected directly to said shift rail and arrangedbelow and fulcrumed on the top plate to move substantially in the planeof movement of the shift rail, such angular levers being connected tothe shift rail intermediate the ends thereof as well as near its endsand each having a substantially horizontally disposedarm connected tothe shift rail and a substantially vertically-disposed arm, a link thatconnects said substantiallyvertically disposed arms, a contractilecounter balance spring connected at one end to said link and anchored atthe other end, and an upright actuating link connected to thehorizontally disposed arm of one of said angular levers.

23. The combination of a frame comprising two relatively movablesections, a case shiftable part, and power actuated mechanism foreffecting a case shifting movement of .said shiftable part, saidmechanism having separable. members carried by the two sections andwhich are brought into cooperative relation prepared to function whenthe sections are brought together.

24. The combination of a frame comprising two relatively movablesections, a case shift'able part, and power actuated mechanism foreffecting a case shifting movement of said shiftable part, saidmechanism comprising a motor driven cam and shifting means actuatedthereby contained in one of said frame sections, and cooperativeshifting means carried by the other of said frame sections, saidshifting means in the two sections being separable when one section isdisplaced from the other and brought into cooperative relation tofunction when brought together.

the two sections are 25. The combination of a frame comprising tworelatively movable sections, a case shiftable part, and power actuatedmechanism for effecting a case shifting movement of said shiftable part,said' mechanism having separable members carried by the two sections andwhich are brought into cooperative relation prepared to function whenthe sections are brought together, said separable members comprising acase shift actuated link operatively connected to said shiftable partand carried by one frame section and a motor actuated arm cooperativewith said link and carried by the other of said frame sections.

FREDERICK A. HART.

CERTIFICATE or commit.

Patent No. l, 929, 064.

October 3, 1933.

FREDERICK A. HART.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 3,line 69, for

"for" read or; and'that the said Letters Patent should be read with thiscorrection therein that the same may Patent Office.

conform to the record of the case in the Signed and sealed this 9th dayof January, A. D. 1934.

(Seal) F. M. Hopkins Acting Commissioner of Patents.

